The Air Force wants its new hypersonic aircraft ready by 2023

In May of 2013, the Air Force successfully tested the X-51 WaveRider — an uncrewed, hypersonic "scramjet" capable of reaching Mach 5.1, or more than five times the speed of sound — by flying it at hypersonic speeds over the Pacific Ocean. Now, the Air Force is looking ahead to its next aircraft.

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